It is very important that the first layer of your print is strongly connected to the printer’s build platform so that the remainder of your part can be built on this foundation. If the first layer is not sticking to the build platform, it will create problems later on. There are many different ways to cope with these first layer adhesion problems, so we will examine several typical causes below and explain how to address each one.
1、Build platform is not level
Many printers include an adjustable bed with several screws or knobs that control the position of the bed. If your printer has an adjustable bed and you’re having trouble getting your first layer to stick to the bed, the first thing you will want to verify is that your printer’s bed is flat and level. If the bed is not level, one side of your bed may be too close to the nozzle, while the other side is too far away. Achieving a perfect first layer requires a level print bed. You should re-level the machine according to mostfunPro manual or auto-leveling.
2、First layer is printing too fast
If you print the first layer too fast, the plastic may not have time to bond to the build platform. For this reason, it is typically very useful to print the first layer at a slower speed so that the plastic has time to bond to the bed. C4M provides a setting for this exact feature. Start the software, click “Setting”——“Expert config”——“Bottom Layer Speed”. Lower the value to slower the printing speed, the recommended speed is 20mm/s.
3、Adhesive of the build platform surface (tape, glues, and materials)
Different plastics tend to adhere better to different materials. We recommend you to use the same glue stick as the accessories of mostfun Pro or you may fail to stick the prints on the bed.
4、Temperature or cooling settings is not right
Plastic tends to shrink as it cools from a warm temperature to a cool temperature. To provide a useful example, imagine a 100mm wide part that is being printed with ABS plastic. If the extruder was printing this plastic at 230 degrees Celsius, but it was being deposited onto a cold build platform, it is likely that the plastic would quickly cool down after leaving the hot nozzle. If this ABS part cooled down to a room temperature of 30C, the 100mm wide part would shrink by almost 1.5mm! Unfortunately, the build platform on your printer is not going to shrink this much, since it is typically kept at a fairly constant temperature. Because of this fact, the plastic will tend to separate from the build platform as it cools. If you notice that the layer seems to stick initially, but later separates from the print bed as it cools, it is possible that your temperature and cooling settings are to blame.
If the heated bed maintain a temperature of 110C for the entire print, it will keep the first layer warm so that it does not shrink. So, try heating the bed to prevent the first layer from cooling. As a general starting point, PLA tends to adhere well to a bed that is heated to 60-70C, while ABS generally works better if the bed is heated to 100-120C. You can adjust these settings in C4M by clicking on “Settings” ——“Advanced”——“Bed temperature”, then click on the value to change it.
5、When all else fails: Brims and Rafts
Sometimes you are printing a very small part that simply does not have enough surface area to stick to the build platform surface（Such as spherical objects）. C4M includes several options that can help increase this surface area to provide a larger surface to stick to the print bed. One of these options is called a “brim.” The brim adds extra rings around the exterior of your part, similar to how a brim of a hat increases the circumference of the hat. C4M also allows users to add a raft under their part, which can also be used to provide a larger surface for bed adhesion. Both of the two options can be find in “Settings”——“Platform adhesion type”.